Telephone-receiver.



. Patented-Oct. I, |90I.

H. L. WHITE. l l TELEPHUNE REGEIVER.l

(Application mea mr. 22, 19Go.)

(No Model.)

.llnllllll INVENTO III/BE' PE1-Ens cc.. FNoruLlTHo., wAsklnoTou D c UNITED STATES PATENT EEicE.

HUBERT LAWRENCE WHITE, OF UTICA, NEV YORK.

TELEPHONE-RECEIVER.

SPECIFICATION forming* part Of Letters Eatent N0. 683,631, dated October 1, 1901. Application filed March 22, 1900. Serial No. 9,715. (No model.)

To all wwnt it may concern:

Be it known that I, HUBERT LAWRENCE WHITE, of Utica, in the county of Oneida and State of New York, have invented certain new and useful Improvements in Telephone-Receivers; and I do hereby declare that the following is a full, clear, and exact description of the inveution,which will enable others skilled in the art to which'it appertains to make and use the same, reference being had to the accompanying drawings, and to the igures of reference marked thereomwliich form part of this specification.

The object of my present invention is to provide a telephone receiving instrument which is economical in construction, has provision made for the nice adjustment of parts, and is free from the detrimental inliuence of heat and cold, causing contraction and eX- pansion of the parts, and more particularly the metal parts.

In the drawings, Figure 1 shows a vertical section of a telephone-receiver embodying the features of my invention. Fig. 2 shows the cap of the receiver in section. Fig. 3 shows an edge View of the diaphragm removed from the receiver. Fig. 4 shows a vertical section of parts of the receiver, the inner parts shown being partially withdrawn from the casing, which is also shown in section. Fig. shows, partially in section and partially in side elevation, details of the construction. Fig. 6 shows a top or end view of the receiver with the cap and diaphragm removed. Fig. 7 shows a section taken on line E F of Fig. 1.

Referring to the reference-igures in a more particular description of the device, 1 indicates the permanent magnet. The permanent magnet is secured to a headpiece 4, the ends of the arms of the magnet being received in recesses in the side of the head and secured to the head by screws 3 3, which also pass through and secure the electromagnetcores 2 2, which are also received in the recesses in the sides of the head 4t. The head 4 is externally screw-threaded, as indicated at 5, and is also recessed along opposite sides through the screw-threads to provide passages for the wires leading to the electromagnets. The electromagnets'are indicated by 6 6. The head 4e is screw-threaded into the boss of the cup 7. The cup 7 is secured to `the shell `8 by screw-threads (indicated by 9 on the external surface of the boss of the cup) engaging with internal threads on the shell 8.. The shell and cup are provided with meet'- ing shoulders, as indicated at 10, so that when the cup is screwed into the shell it comes to a firm and true bearing at' the shoulders 10. The diaphragm is supported on the face end of the cup 7 over the poles of the magnet and is secured in position by the cap 12, which is screw-threaded onto the end of the cup by screw-threads, (indicated by 13.) The cap 12 is provided with the usual opening14: over the center of the diaphragm. The portion of the shell 8 which incloses the cup 7 is arranged so that the walls of the shell do not touch the wall of the cup except at the shoulders 10. The arrangement of the parts is such that the end of the shell next to the cap approaches the iianged edge of the cap so closely as not to leave an objectionable opening, but still remain out of contact, so that any expansion or contraction of the shellor other parts will not injuriously affeet the relative arrangement and adjustment of the parts. On the externally-screwthreaded head 4 there is also provided a lock ring or nut 15, which is adapted to be screwed down onto the interior surface of the cup 7 and lock the cup and head 4 together when they are properly adjusted. Tofurther secure the device in position lafter adjustment, and more particularly lock the ring 15, there are provided set-screws 16, passing through the ring and adapted to engage on the inner surface of the cup.

The wires for the electromagnets are let down recesses in thesides of the head 4, as before pointed out. The wires are indicated in the drawings by 17 and are attached to cond uctor-plates 1S, mounted on an insulating-block 19 between the parts of the permanent magnet, and from the plates 18 extends the cable, passing out of a suitable opening in the end of thevshell.

The operation of the device is too Well understood to warrant special description.

o What I claim as new, and desire to secure by Letters Patent, is-

1. In a telephone-receiver, the combination of the permanent and electro magnets mounted on the externally-screW-threaded head, a cup having an externally' and internally screw-threaded boss receiving the said head, a shell inclosing the cup and magnets, and screw-threaded onto the said boss of the cup and engaging against the base of the cup only, a diaphragm mounted on the edge of the cup and a anged cap screw-threaded onto the periphery of the cup, substantially as set forth.

2. In a telephone-receiver, the combination of a permanent horseshoe-magnet, an externally-screw-threaded head recessed from opposite sides through the screw-threads to receive the poles of the permanent magnet, electromagnets having pole-pieces also secured in said recesses of said head, a cup having' an externally and internally screwthreaded boss, said boss receiving the said head, a diaphragm mounted on the edges of said cup over said electromagnets, and a cap securingsaid diaphragm in place, substantially as set forth.

3. In a telephone-receiver the combination of an externally-sereWfthreaded head, a permanent and electro-magnets mounted on said head, a cap having an externally and internally screw-threaded boss, said boss receiving said head, grooves or recesses in the edge of said head affording passage-Ways for the electric conductors to the electromagnets, a diaphragm mounted on the edge of said cup over said electromagnets, a cap securing said diaphragm in place and a casing nclosing said diaphragm and cup and screW-threadedonto said cup-boss, substantially as set forth.

In Witness whereof I have affixed my signature, in presence ofptwo witnesses, this 15th day of March, 1900.

HUBERT LAWRENCE VHITE.

Witnesses:

SARAH A. BROWN,

WILLARD JoNEs. 

